<!DOCTYPE html>

<html>
<head>
<meta charset="UTF-8">
<link href="style.css" type="text/css" rel="stylesheet">
<title>VZEROALL—Zero All YMM Registers </title></head>
<body>
<h1>VZEROALL—Zero All YMM Registers</h1>
<table>
<tr>
<th>Opcode/Instruction</th>
<th>Op/En</th>
<th>64/32 bit Mode Support</th>
<th>CPUID Feature Flag</th>
<th>Description</th></tr>
<tr>
<td>
<p>VEX.256.0F.WIG 77</p>
<p>VZEROALL</p></td>
<td>NP</td>
<td>V/V</td>
<td>AVX</td>
<td>Zero all YMM registers.</td></tr></table>
<h3>Instruction Operand Encoding</h3>
<table>
<tr>
<td>Op/En</td>
<td>Operand 1</td>
<td>Operand 2</td>
<td>Operand 3</td>
<td>Operand 4</td></tr>
<tr>
<td>NP</td>
<td>NA</td>
<td>NA</td>
<td>NA</td>
<td>NA</td></tr></table>
<h2>Description</h2>
<p>The instruction zeros contents of all XMM or YMM registers.</p>
<p>Note: VEX.vvvv is reserved and must be 1111b, otherwise instructions will #UD. In Compatibility and legacy 32-bit mode only the lower 8 registers are modified.</p>
<h2>Operation</h2>
<p><strong>VZEROALL (VEX.256 encoded version)</strong></p>
<pre>IF (64-bit mode)
    YMM0[VLMAX-1:0] (cid:197) 0
    YMM1[VLMAX-1:0] (cid:197) 0
    YMM2[VLMAX-1:0] (cid:197) 0
    YMM3[VLMAX-1:0] (cid:197) 0
    YMM4[VLMAX-1:0] (cid:197) 0
    YMM5[VLMAX-1:0] (cid:197) 0
    YMM6[VLMAX-1:0] (cid:197) 0
    YMM7[VLMAX-1:0] (cid:197) 0
    YMM8[VLMAX-1:0] (cid:197) 0
    YMM9[VLMAX-1:0] (cid:197) 0
    YMM10[VLMAX-1:0] (cid:197) 0
    YMM11[VLMAX-1:0] (cid:197) 0
    YMM12[VLMAX-1:0] (cid:197) 0
    YMM13[VLMAX-1:0] (cid:197) 0
    YMM14[VLMAX-1:0] (cid:197) 0
    YMM15[VLMAX-1:0] (cid:197) 0
ELSE
    YMM0[VLMAX-1:0] (cid:197) 0
    YMM1[VLMAX-1:0] (cid:197) 0
    YMM2[VLMAX-1:0] (cid:197) 0
    YMM3[VLMAX-1:0] (cid:197) 0
    YMM4[VLMAX-1:0] (cid:197) 0
    YMM5[VLMAX-1:0] (cid:197) 0
    YMM6[VLMAX-1:0] (cid:197) 0
    YMM7[VLMAX-1:0] (cid:197) 0
    YMM8-15: Unmodified
FI</pre>
<h2>Intel C/C++ Compiler Intrinsic Equivalent</h2>
<p>VZEROALL:</p>
<p> _mm256_zeroall()</p>
<h2>SIMD Floating-Point Exceptions</h2>
<p>None.</p>
<h2>Other Exceptions</h2>
<p>See Exceptions Type 8.</p></body></html>